/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics;

import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.View;

public class ScaleToFit extends GraphicsActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new SampleView(this));
	}

	private static class SampleView extends View {
		private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		private final Paint mHairPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		private final Paint mLabelPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
		private final Matrix mMatrix = new Matrix();
		private final RectF mSrcR = new RectF();

		private static final Matrix.ScaleToFit[] sFits = new Matrix.ScaleToFit[] {
				Matrix.ScaleToFit.FILL, Matrix.ScaleToFit.START,
				Matrix.ScaleToFit.CENTER, Matrix.ScaleToFit.END };

		private static final String[] sFitLabels = new String[] { "FILL",
				"START", "CENTER", "END" };

		private static final int[] sSrcData = new int[] { 80, 40, Color.RED,
				40, 80, Color.GREEN, 30, 30, Color.BLUE, 80, 80, Color.BLACK };
		private static final int N = 4;

		private static final int WIDTH = 52;
		private static final int HEIGHT = 52;
		private final RectF mDstR = new RectF(0, 0, WIDTH, HEIGHT);

		public SampleView(Context context) {
			super(context);

			mHairPaint.setStyle(Paint.Style.STROKE);
			mLabelPaint.setTextSize(16);
		}

		private void setSrcR(int index) {
			int w = sSrcData[index * 3 + 0];
			int h = sSrcData[index * 3 + 1];
			mSrcR.set(0, 0, w, h);
		}

		private void drawSrcR(Canvas canvas, int index) {
			mPaint.setColor(sSrcData[index * 3 + 2]);
			canvas.drawOval(mSrcR, mPaint);
		}

		private void drawFit(Canvas canvas, int index, Matrix.ScaleToFit stf) {
			canvas.save();

			setSrcR(index);
			mMatrix.setRectToRect(mSrcR, mDstR, stf);
			canvas.concat(mMatrix);
			drawSrcR(canvas, index);

			canvas.restore();

			canvas.drawRect(mDstR, mHairPaint);
		}

		@Override
		protected void onDraw(Canvas canvas) {
			canvas.drawColor(Color.WHITE);

			canvas.translate(10, 10);

			canvas.save();
			for (int i = 0; i < N; i++) {
				setSrcR(i);
				drawSrcR(canvas, i);
				canvas.translate(mSrcR.width() + 15, 0);
			}
			canvas.restore();

			canvas.translate(0, 100);
			for (int j = 0; j < sFits.length; j++) {
				canvas.save();
				for (int i = 0; i < N; i++) {
					drawFit(canvas, i, sFits[j]);
					canvas.translate(mDstR.width() + 8, 0);
				}
				canvas.drawText(sFitLabels[j], 0, HEIGHT * 2 / 3, mLabelPaint);
				canvas.restore();
				canvas.translate(0, 80);
			}
		}
	}
}
